Fourteen people connected to resistance of Vladimir Putin have died on British soil. Every case has been closed, the deaths deemed of natural causes. American intelligence believes they were all assassinated by the Kremlin.

Throughout 2015 and 2016, amid a series of conversations I had socially with gay and bisexual men about chemsex, new, darker elements to this scene began to emerge; details from unconnected participants that mirrored each other – the same incidents, the same crimes, sometimes even the same culprits. Together they formed a picture: that beneath the surface reports about chemsex – the endless hedonism, the irresistibly intense sex – there is a much blacker sea, unmapped.